JP2000142938A - Protection structure of belt meandering detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent meandering of a conveyor belt from being erroneously detected by surely preventing coarsely crushed product after drying from interrupting the light receiving part of a meandering detecting device. SOLUTION: This protection structure is provided to a belt type drying device 1 for drying a viscous water-soluble substance M1 fed to the upper stream of a conveyor belt 2 through a feed nozzle until it reaches the lower stream end by rotation of the conveyor belt 2, and coarsely crushing by a coarse crusher 4 at the lower stream end into coarsely crushed product M3. A fall preventing plates 61 arranged so that the lower end edges are faced to side surface of the conveyor belt 2, and the upper end edges are positioned on the outer upper positions of the lower end edges, on the positions corresponding to optical paths of light emitted from a light emitting part 51. The fall preventing plates 61 is formed so as not to interfere in the optical paths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection structure for a belt meandering detection device attached to a so-called belt-type drying device for drying an object to be dried while being transported by a conveyor belt.

[0002]

2. Description of the Related Art Conventionally, a viscous raw material such as a polymer solution stored in a raw material tank is supplied onto a driving conveyor belt via a raw material supply device located at an upstream end of the conveyor belt. A so-called belt-type drying apparatus is known, in which a drying process is performed on a raw material that sequentially moves by the rotation. In such a belt-type drying apparatus, usually, a plurality of conveyor belts are arranged in a vertical direction, and a crusher for coarsely crushing a dried product is provided at a downstream end of each conveyor belt. Crushes the dried product into coarse products.

[0003] Further, in the belt-type drying apparatus as described above, there is a disadvantage that if the conveyor belt meanders, the defective rate increases. Therefore, in order to avoid such inconvenience, a meandering detection device is provided at the upstream end and / or the downstream end of the conveyor belt. When the meandering detection device detects the meandering of the conveyor belt, the driving of the conveyor belt is temporarily stopped. The belt is stopped, the belt is wrapped around it so that it does not meander, and then restarted.

As the meandering detection device, a so-called photoelectric switch in which a light emitting unit and a light receiving unit are vertically opposed is employed. The light emitting unit and the light receiving unit are installed at positions that are separated from the opposite ends of the conveyor belt by an allowable distance, and are installed at positions that are vertically opposed.

Therefore, when the conveyor belt is rotating at the normal position, the light from the light emitting section reaches the light receiving section to determine that the conveyor belt does not meander. Meandering, the light emitted from the light emitting unit is blocked by the conveyor belt and does not reach the light receiving unit, thereby detecting the meandering of the conveyor belt.

[0006] The meandering detection device as described above is generally provided at the upstream end and / or the downstream end of the conveyor belt. The reason is that the meandering displacement is the largest at the end, so that the meandering can be easily detected.

[0007]

At the downstream end of the conveyor belt, there is provided a crusher for crushing the dried product, and a part of the products crushed by the crusher is provided at the downstream end of the conveyor belt. The main cause is scattering.
The light from the light emitting unit may be blocked. Therefore, in the conventional meandering detection device as described above, the light from the light emitting unit is not blocked by the products or the like scattered even though the conveyor belt does not meander, and does not reach the light receiving unit. There is a problem that it may be determined that the meandering is meandering.

If the meandering detection device erroneously detects meandering even though the conveyor belt is not meandering, the driving of the conveyor belt is automatically stopped. In addition, the quality of the product, such as coloring due to overdrying, occurs once the conveyor belt stops, and the production cost increases accordingly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reliably prevent light from a light emitting portion from being blocked by a crushed product or the like. An object of the present invention is to provide a protection structure for a belt meandering detection device in a belt-type drying device that can reliably prevent erroneous detection.

[0010]

According to a first aspect of the present invention, there is provided a belt meandering detecting device for protecting a belt meandering device, wherein a raw material supplied to an upstream end of a conveyor belt via a raw material supply device is downstreamly circulated around the conveyor belt. Dry before reaching the end,
A protection structure for a belt meandering detection device attached to a belt-type drying device that is crushed by a crusher at the downstream end to make a crushed product, at a position separated by an allowable distance in the width direction from both ends of the conveyor belt. A meandering detection device comprising a light-emitting unit and a light-receiving unit disposed opposite to each other at an upper position and a lower position, and an inclined shield disposed such that an upper end edge is located outside a side of the conveyor belt. A plate is provided, and the inclined shielding plate is shaped or positioned so as not to interfere with the optical path.

According to the protection structure of the belt meandering detecting device, the crushed product formed by crushing at the downstream end of the conveyor belt by the crusher is scattered toward the upstream side of the conveyor belt even if the crushed product is scattered toward the upstream side of the conveyor belt. To be returned to the conveyor belt by being supplemented by the inclined shielding plate that is arranged inclined to
The scattered crushed product interferes with the optical path and the irradiation light from the light-emitting unit does not reach the light-receiving unit, and this makes it possible to reliably detect the inconvenience that the conveyor belt is meandering even though it does not meander. Is prevented.

In addition, since the inclined shielding plate is shaped so as not to interfere with the optical path of the light emitted from the light emitting section, the light emitted from the light emitting section can be reliably transmitted to the light receiving section unless the conveyor belt meanders. To reach. Therefore, there is no problem in detecting the meandering of the conveyor belt.

According to a second aspect of the present invention, there is provided a protection structure for a belt meandering detecting device according to the first aspect, wherein the conveyor belt is provided in a plurality of stages, and at least a lowermost conveyor belt is provided. It is characterized in that the above-mentioned inclined shielding plate is provided.

According to a third aspect of the present invention, there is provided a protection structure for a belt meandering detecting device according to the first or second aspect, wherein the conveyor belt is provided in a plurality of stages, and at least a lowermost stage is provided. The inclined shielding plate attached to the conveyor belt is widely dimensioned so as to interfere with the optical path, and an optical path hole is formed in an interference portion with the optical path to allow irradiation light from the light emitting section to reach the light receiving section. It is characterized by becoming.

According to the protection structure of the belt meandering detecting device, even if the scattered crushed articles fall downward on the upper conveyor belt without being caught by the inclined shielding plate,
Since the inclined shielding plate of the lowermost conveyor belt is set to have dimensions wide enough to interfere with the optical path from the light emitting unit, the scattered crushed material not captured at the upper portion is captured by the shielding plate and returned to the conveyor belt. Therefore, the inconvenience that the crushed product accumulates on the light receiving portion and interferes with the optical path is more reliably prevented. In addition, since the lowermost inclined shield plate is provided with an optical path hole, the irradiation light from the light emitting unit reaches the light receiving unit through the optical path hole. Therefore, the meandering of the conveyor belt can be normally detected after the inclined shield plate is enlarged.

According to a fourth aspect of the present invention, there is provided a protection structure for a belt meandering detecting apparatus according to any one of the first to third aspects, wherein the inclined shield plate has a frictional surface. It is coated with a coating material made of a material having a small coefficient.

According to the protection structure of the belt meandering detecting device, the crushed product supplemented by the inclined shielding plate has its surface covered with a coating material having a small friction coefficient because the surface of the inclined shielding plate is covered with a coating material having a small coefficient of friction. It slides down smoothly and is returned to the conveyor belt without adhering to the surface.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an example of a process diagram for manufacturing a product using a belt-type drying apparatus to which a protection structure of a belt meandering detection apparatus according to the present invention is applied. As shown in FIG. 1, the product is stored in a storage step P1, a drying step P2, a pulverization step P2.
3 manufactured. The viscous material M1 as the raw material is stored in the storage tank
11 and is provided to the drying step P2 by driving the pressure feed pump P12 as appropriate.

In the drying step P2, the belt-type drying apparatus 1 to which the present invention is applied is employed. Then, the viscous material M1 from the storage tank P11 is injected into the upstream end of the conveyor belt via the raw material supply device 3 (FIG. 2) in the belt-type drying device 1, and is elongated on the belt surface by the rotation of the conveyor belt. Is formed (hereinafter, referred to as a long product M2). These long products M2 are dried and solidified by a predetermined drying means before reaching the downstream end around the conveyor belt, and solidified in the next pulverizing step P3.
Sent to.

The crushing step P3 is performed by a crusher attached to the downstream end of the conveyor belt. That is, the long product M2 conveyed to the downstream end by the conveyor belt is roughly crushed (crushed) by a crusher at a position protruding outside from the conveyor belt in the pulverizing step P3 to be a short product M3 of a predetermined size. .

FIG. 2 is an overall configuration diagram showing an embodiment of the belt-type drying device. As shown in FIG. 2, the belt-type drying device 1 includes a box-shaped housing 11, a plurality of vertically arranged conveyor belts 2 installed in the housing,
A raw material supply device 3 disposed at an upstream end of each conveyor belt 2; a crusher 4 disposed at the downstream end; a belt meandering detection device 5 for detecting meandering of the conveyor belt 2; At the downstream end of the crusher 4 to prevent the short product M3 crushed by the driving of the crusher 4 from jumping and dropping from the side of the conveyor belt 2, thereby preventing the erroneous detection from being performed. And a detection device protection structure 6 for protection.

As shown in FIG. 2, the meandering detecting device 5 includes a pair of light emitting portions 51 in the width direction provided on the upper end of the uppermost conveyor belt 2 on the upstream end side and the downstream end side. And four light-receiving portions 52 provided opposite to the light-emitting portions 51 at a further lower position of the conveyor belt 2. The light emitting unit 51 includes a light source that irradiates light directly downward, while the light receiving unit 52 includes a photoelectric conversion device that excites an electromotive force when irradiated with light. Therefore, by detecting the electromotive force of the photoelectric light emitting element, it is possible to determine that there is no interfering object in the optical path 50 between the light emitting unit 51 and the light receiving unit 52. It is possible to determine that an interference object exists at 50. Note that there is no problem even if the vertical positions of the light emitting unit 51 and the light receiving unit 52 are opposite to the above.

In the present embodiment, the light-emitting portion 51 and the light-receiving portion 52 in the width direction are located at positions where the optical path 50 is separated from the side end of the conveyor belt by an allowable range. Therefore, if any of the plurality of conveyor belts 2 meanders and interferes with the optical path 50, the light from the light emitting unit 51 does not reach the light receiving unit 52, whereby the meandering of the conveyor belt 2 is detected. It has become.

Further, in the present embodiment, at least the light emitting section 51 or the light receiving section 52 provided at the lower position on the downstream side of the attached belt meandering detecting device is configured to be supplied with blast air. This prevents erroneous detection of belt meandering caused by the short article M3 dropped from the conveyor belt 2 blocking the optical path 50. Hereinafter, the air blowing means as an erroneous detection prevention structure will be described using the light receiving unit 52 on the downstream side as an example. FIG. 3 is a partially cutaway perspective view showing an embodiment of the light receiving section 52 on the downstream side.
As shown in this figure, the light receiving portion 52 is a cylindrical light receiver 5 having a light receiving surface 53a of a light receiving element on the upper surface and extending in the vertical direction.
3 and a protective tube 54 into which the light receiver 53 is fitted concentrically.
And a support cylinder 55 that supports the protection cylinder 54 and has the same diameter as the protection cylinder 54, and a compressor 56 that sends compressed air into the protection cylinder 54. The compressor 56 includes a short product M that has fallen on the upper part of the protection cylinder 54.
The ejection capacity is set in advance so that 3 can be blown off.

The light receiving portion 53 is mounted at a central position in the light receiver support member 54a by a light receiver support member 54a having a plurality of support arms projecting from the inner peripheral surface of the protective cylinder 54 toward the center. ing. The upper end of the light receiver 53 projects slightly outside from the upper opening of the protection tube 54, and the short product M3 that has fallen in the housing 11 straddles the upper edge of the light receiver 53 and the upper edge of the protection tube 54. Even if it lands, it slides down due to the inclination between the edges, thereby making it difficult for the short product M3 to stay on the light receiving surface 53a.

According to such an erroneous detection prevention structure, the compressed air is constantly supplied into the protection cylinder 54 by driving the compressor 56, so that the upper edge of the protection cylinder 54 is in contact with the inner peripheral surface of the protection cylinder 54. Air is ejected from an annular gap 534 formed between the light receiving surface 53 and the light receiving surface 5.
3a is surrounded by the jet of air, so that even if the short product M3 falls and tries to land on the light receiving surface 53a, it is blown off by the jet flow and the short product M3 is placed on the light receiving surface 53a. Is deposited and optical path 5
0 can be reliably prevented, thereby making it possible to eliminate erroneous detection in which the belt meandering detection device 5 detects meandering even though the conveyor belt 2 does not meander.

In the present invention, the detection device protection structure 6 is employed as an erroneous detection prevention structure in addition to the air blowing means. This detector protection structure 6
As shown in FIG. 2, a pair of width-preventing plates 61 provided in the downstream direction of the conveyor belt 2 is provided. This fall prevention plate 61 is provided for the upper stage fall prevention plate 6 provided for the conveyor belt 2 of the second or more stages from the bottom.
2 and a lowermost drop prevention plate 63 provided for the lowermost conveyor belt 2.

The upper surface of the fall prevention plate 61 is coated with a coating material made of a material having a small friction coefficient.
As a result, the short product M3 captured by the fall prevention plate 61 is smoothly slid down and returned onto the conveyor belt 2. Examples of the coating material include an adhesive tape made of polytetrafluoroethylene.

As shown in FIG. 2, each upper-stage drop prevention plate 62 is parallel to the conveyor belt 2 between the light emitting section 52 and the crusher 4 and has a lower end edge in the width direction of the conveyor belt 2. It is slidably in contact with both ends or opposed to the conveyor belt 2 with a slight gap therebetween, and is disposed so as to be inclined so that the upper edge portion is located outside the conveyor belt 2. Also, the upper-stage fall prevention plate 62 is
The front and rear dimensions are set so that the upstream edge does not interfere with the optical path 50. By providing such an upper-stage fall prevention plate 62 on the downstream end side of the conveyor belt 2 of the uppermost stage to the second stage from the bottom, even if the short-length product M3 scatters, the short-length product M3 is attached to the upper-stage fall prevention plate 62. It will be supplemented and returned on the conveyor belt 2.

As shown in FIG. 2, the lowermost drop-preventing plate 63 has basically the same configuration as the upper-stage drop-preventing plate 62, but has a larger planar shape than the upper-stage drop-preventing plate 62. Dimensions are set. Specifically, the front-rear dimension and the width of the lowermost drop-prevention plate 63 are set to be considerably larger than those of the upper-stage drop-prevention plate 62, whereby the lowermost drop-prevention plate 63 supplements the scattered short product M3. Performance has been greatly improved. However, the lowermost drop prevention plate 63 interferes with the optical path 50 as it is. In order to avoid this interference, in the present embodiment, a light passage hole 63a is formed at a position where the lowermost fall prevention plate 63 interferes with the optical path 50, so that light from the light emitting unit 51 is received by the light receiving unit 52.
To the light receiving surface 53a.

Note that part or all of the upper-stage drop prevention plate 62 may be used as the lowermost-stage drop prevention plate 63, or only the lowermost-stage fall-prevention plate 63 may be used without using the upper-stage drop prevention plate 63. It is also possible to use.

According to the detection device protection structure 6, even if the short product M 3 scatters toward the upstream side, the scattered short product M 3 is retained by the fall prevention plate 6 provided on each conveyor belt 2.
1 and is returned on the conveyor belt 2, so that the light path 50 is blocked by the scattered short products M <b> 3, and the inconvenience of erroneously detecting that the conveyor belt 2 has meandered even though the conveyor belt 2 does not meander is prevented. .

In particular, the lowermost drop prevention plate 63 is
Since the plane size is set to be larger than that of the upper-stage drop prevention plate 62, even if the short product M3 jumps over the upper-stage drop prevention plate 62 and scatters, it is possible to supplement the light path 50 by the short product M3. Can be reliably prevented from being interrupted. Further, the lowermost drop prevention plate 63 is replaced with a short product M3.
By setting the size to be larger than the scattering range, the accumulation of the short product M3 on the lower portion of the housing 11 is reduced,
Maintenance costs can be reduced.

[0034]

According to the protection structure of the belt meandering detection device of the present invention, erroneous detection of belt meandering caused by scattering of products crushed by the crushing machine can be reliably prevented, and the detection is caused by the erroneous detection. It is possible to avoid the disadvantage that productivity is reduced due to production interruption.

[Brief description of the drawings]

FIG. 1 is a process diagram of manufacturing a product using a belt-type drying device to which a protection structure of a belt meandering detection device according to the present invention is applied.

FIG. 2 is a sectional view showing one embodiment of a belt type dryer.

FIG. 3 is a partially cutaway perspective view showing an embodiment of a light receiving section on the downstream side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt type drying device 11 Housing 2 Conveyor belt 3 Raw material supply device 4 Crusher 5 Belt meandering detection device 51 Light emitting part 52 Light receiving part 53 Light receiving device 53a Light receiving surface 54 Protective cylinder 54a Light receiving device support member 55 Support cylinder 56 Compressor 6 Detector Protective structure 61 Fall prevention plate 62 Fall prevention plate for upper stage 63 Fall prevention plate for lowermost stage P1 Storage process P2 Drying process P3 Crushing process M1 Viscous material (raw material) M2 Long product M3 Short product

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hisashi Ouchi 992, Nishioki, Okihama-shi, Aboshi-ku, Himeji-shi, Hyogo 1 Inside Nippon Shokubai Co., Ltd. Nippon Shokubai Co., Ltd. (72) Katsuhiko Harada Inventor F-term (reference) 3F023 AA01 BA02 BB01 BC01 CA02 GA01 3F025 BA02 BB05 BC07

Claims (4)

[Claims] 1. A method of drying a raw material supplied to an upstream end of a conveyor belt through a raw material supply device before reaching a downstream end around the conveyor belt and crushing the raw material by a crusher at the downstream end. Protection structure of a belt meandering detection device attached to a belt-type drying device that crushes the product,
A meandering detection device including a light emitting unit and a light receiving unit disposed opposite to each other at an upper position and a lower position at a position separated by an allowable distance in the width direction from both ends of the conveyor belt is provided, and an upper end edge of the conveyor belt is provided. An inclined shielding plate disposed outside the side portion is provided, and the inclined shielding plate is shaped or positioned so as not to interfere with the optical path. Protection structure. 2. The conveyor belt is provided in a plurality of stages,
The protection structure for a belt meandering detection device according to claim 1, wherein the inclined shielding plate is provided on at least a lowermost conveyor belt. 3. The conveyor belt is provided in a plurality of stages, and an inclined shielding plate attached to at least a lowermost conveyor belt is set to have a wide dimension so as to interfere with the optical path, and a portion interfering with the optical path. 3. The protection structure for a belt meandering detection device according to claim 1, wherein an optical path hole for allowing irradiation light from the light emitting unit to reach the light receiving unit is formed in the light emitting unit. 4. The protection structure for a belt meandering detecting device according to claim 1, wherein the surface of the inclined shield plate is coated with a coating material made of a material having a small coefficient of friction.